The Bruins have retired 10 jersey numbers (11 if you include Gretzky).
# 2 Eddie Shore
# 3 Lionel Hitchman (First professional hockey player to have number retired Feb. 22, 1934)
# 4 Bobby Orr
# 5 Aubrey "Dit" Clapper
# 7 Phil Esposito
# 8 Cam Neely
# 9 Johnny Bucyk
# 15 Milt Schmidt
# 24 Terry O'Reilly
# 77 Ray Bourque
Ray Bourque Picked #77 instead of #7, by choice, out of respect for Phil Esposito. Espo Gave him Permission to use it and agreed they'd hang from the rafters together once Bourque Retired, But Ray saw it otherwise.